问题：
[单选题]标有额定值为“220V、100W”和“220V、25W”白炽灯两盏，将其串联后接入220V工频交流电源上，其亮度情况是（ ）
A、100W的灯泡较亮
B、25W的灯泡较亮
C、两只灯泡一样亮
参考答案：
B
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